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CBSE Class 9 Answered

A hollow cylindrical pipe 21 dm long is made of copper. Its outer and inner diameters are 10 cm and 6 cm respectively. Find the volume of the copper used in making the pipe.
Asked by Topperlearning User | 10 Apr, 2014, 03:24: PM
answered-by-expert Expert Answer

Let h = height of the pipe = 21 dm = 210 cm

R = External Radius =

r = Internal Radius =

Volume of copper used in making the pipe

= Volume of External cylinder - Volume of Internal cylinder

Answered by | 10 Apr, 2014, 05:24: PM
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